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disk.c
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disk.c
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/* $Id: disk.c 15.12 1999/03/25 22:05:00 Michiel Exp Michiel $ */
/* $Log: disk.c $
* Revision 15.12 1999/03/25 22:05:00 Michiel
* fixed deldir related (beta) bug
*
* Revision 15.11 1999/02/22 16:25:30 Michiel
* Changes for increasing deldir capacity
*
* Revision 15.10 1998/09/27 11:26:37 Michiel
* ErrorMsg param
*
* Revision 15.9 1998/09/03 07:12:14 Michiel
* versie 17.4
* bugfixes 118, 121, 123 and superindexblocks and td64 support
*
* Revision 15.8 1998/04/23 22:27:07 Michiel
* FakeCachedRead toegevoegd om munglist check hits te voorkomen
* Bug in WriteToFile opgelost: toevoeging CorrectAnodeAc
*
* Revision 15.7 1997/03/03 22:04:04 Michiel
* Release 16.21
*
* Revision 15.6 1996/03/14 19:32:56 Michiel
* Fixed ChangeFileSize bug: had no effect when # blocks remained constant
*
* Revision 15.5 1996/01/03 09:58:36 Michiel
* replaced CopyMem() by memcpy()
*
* Revision 15.4 1995/12/21 11:59:31 Michiel
* bugfixes: ValidateCache() block flushing and
* WriteToFile expensive last block
*
* Revision 15.3 1995/12/21 11:32:44 Michiel
* code cleanup
*
* Revision 15.2 1995/12/14 13:24:08 Michiel
* Direct SCSI support
*
* Revision 15.1 1995/12/05 15:47:27 Michiel
* Rollover files implemented
* Restructured: ReadFromObject, WriteToObject etc
* bugfixes
*
* Revision 14.4 1995/11/15 15:44:40 Michiel
* WriteToFile, ChangeFileSize adapted to postponed op.
*
* Revision 14.3 1995/11/07 14:57:31 Michiel
* support for online directory update in WriteToFile and ChangeFileSize
* ReservedAreaLock check
*
* Revision 14.2 1995/10/11 23:25:24 Michiel
* UpdateSlot added: improved sequential write
*
* Revision 14.1 1995/10/11 22:18:30 Michiel
* new data-caching algorithm
*
* Revision 13.2 1995/10/05 11:01:32 Michiel
* minor changes
*
* Revision 13.1 1995/10/03 11:08:55 Michiel
* merged with developtree: anodecache
*
* Revision 12.15 1995/09/04 09:57:10 Michiel
* mask check now starts at first whole block and includes last block
*
* Revision 12.14 1995/09/01 11:20:15 Michiel
* RawRead and RawWrite error handling changed:
* on error a retry|cancel requester appears. Retry and
* same volumecheck changed. Numsofterrors update added.
*
* Revision 12.13 1995/08/24 13:48:26 Michiel
* TD_DiskChange checking enabled
*
* Revision 12.12 1995/08/21 04:25:48 Michiel
* better checks for out of memory
*
* Revision 12.11 1995/08/04 04:13:15 Michiel
* extra CUTDOWN protection
*
* Revision 12.10 1995/07/21 06:48:51 Michiel
* DELDIR adaptions
* bugfix: MaxTransfer now doesn't have to be multiple of blocksize
*
* Revision 12.9 1995/07/11 17:29:31 Michiel
* ErrorMsg () calls use messages.c variables now.
*
* Revision 12.8 1995/07/07 14:39:17 Michiel
* AFSLITE stuff
*
* Revision 12.7 1995/06/19 09:42:45 Michiel
* Rawwrite returns error if softprotect is on
*
* Revision 12.6 1995/06/16 10:00:15 Michiel
* using Allec & FreeBufMem
*
* Revision 12.5 1995/06/16 04:06:29 Michiel
* No Touch () in write, just MakeBlockDirty
*
* Revision 12.4 1995/05/20 12:12:12 Michiel
* Updated messages to reflect Ami-FileLock
* CUTDOWN version
* protection update
*
* Revision 12.3 1995/03/30 11:54:29 Michiel
* Write & Setfilesize now set the checknotify flag
*
* Revision 12.2 1995/02/15 16:43:39 Michiel
* Release version
* Using new headers (struct.h & blocks.h)
*
* Revision 12.1 1995/02/02 11:26:11 Michiel
* Version number fix. No changes.
*
* Revision 11.8 1995/01/29 07:34:57 Michiel
* Major update
* ReadFromFile, WriteToFile completely rewritten
* CachedRead added
* DataCaching updated
*
* Revision 11.7 1995/01/26 12:20:42 Michiel
* a minor change
*
* Revision 11.6 1995/01/24 17:44:34 Michiel
* bug fixes
*
* Revision 11.5 1995/01/24 15:54:20 Michiel
* DirectRead, CachedRead etc
*
* Revision 11.4 1995/01/23 16:43:35 Michiel
* Directwrite in WriteToFile added
*
* Revision 11.3 1995/01/18 04:29:34 Michiel
* Bugfixes. Now ready for beta release.
*
* Revision 11.2 1995/01/15 05:24:44 Michiel
* trackdisk specific parts inhibited
*
* Revision 11.1 1995/01/08 16:17:32 Michiel
* Compiled (new MODE_BIG version)
*
* Revision 10.4 1994/11/15 18:06:58 Michiel
* __USE_SYSBASE moved..
*
* Revision 10.3 1994/10/28 06:06:40 Michiel
* uses new listentry field anodenr
*
* Revision 10.2 1994/10/27 11:30:12 Michiel
* *** empty log message ***
*
* Revision 10.1 1994/10/24 11:16:28 Michiel
* first RCS revision
* */
#define TESTING 1
//#define DEBUG 1
#define __USE_SYSBASE
#include <exec/types.h>
#include <exec/memory.h>
#include <exec/devices.h>
#include <exec/io.h>
#include <exec/errors.h>
#include <dos/filehandler.h>
//#include <sprof.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include "debug.h"
// own includes
#include "blocks.h"
#include "struct.h"
#include "disk_protos.h"
#include "allocation_protos.h"
#include "volume_protos.h"
#include "directory_protos.h"
#include "anodes_protos.h"
#include "update_protos.h"
#include "checkaccess_protos.h"
#include "kswrapper.h"
#define PROFILE_OFF()
#define PROFILE_ON()
/**********************************************************************/
/* DEBUG */
/**********************************************************************/
#ifdef DEBUG
static UBYTE debugbuf[120];
extern BOOL debug;
#define DebugOn debug++
#define DebugOff debug=0
#define DebugMsg(msg) if(debug) {NormalErrorMsg(msg, NULL);debug=0;}
#define DebugMsgNum(msg, num) sprintf(debugbuf, "%s 0x%08lx.", msg, num); \
if(debug) {NormalErrorMsg(debugbuf, NULL);debug=0;}
#define DebugMsgName(msg, name) sprintf(debugbuf, "%s >%s<.", msg, name); \
if(debug) {NormalErrorMsg(debugbuf, NULL);debug=0;}
#else
#define DebugOn
#define DebugOff
#define DebugMsg(m)
#define DebugMsgNum(msg,num)
#define DebugMsgName(msg, name)
#endif
enum vctype {read, write};
static int CheckDataCache(ULONG blocknr, globaldata *g);
static int CachedRead(ULONG blocknr, SIPTR *error, BOOL fake, globaldata *g);
static UBYTE *CachedReadD(ULONG blknr, SIPTR *err, globaldata *g);
static int CachedWrite(UBYTE *data, ULONG blocknr, globaldata *g);
static void ValidateCache(ULONG blocknr, ULONG numblocks, enum vctype, globaldata *g);
static void UpdateSlot(int slotnr, globaldata *g);
static ULONG ReadFromRollover(fileentry_t *file, UBYTE *buffer, ULONG size, SIPTR *error, globaldata *g);
static ULONG WriteToRollover(fileentry_t *file, UBYTE *buffer, ULONG size, SIPTR *error, globaldata *g);
static SFSIZE SeekInRollover(fileentry_t *file, SFSIZE offset, LONG mode, SIPTR *error, globaldata *g);
static SFSIZE ChangeRolloverSize(fileentry_t *file, SFSIZE releof, LONG mode, SIPTR *error, globaldata *g);
static ULONG ReadFromFile(fileentry_t *file, UBYTE *buffer, ULONG size, SIPTR *error, globaldata *g);
static ULONG WriteToFile(fileentry_t *file, UBYTE *buffer, ULONG size, SIPTR *error, globaldata *g);
/**********************************************************************/
/* READ & WRITE */
/* READ & WRITE */
/* READ & WRITE */
/**********************************************************************/
ULONG ReadFromObject(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
if (!CheckReadAccess(file,error,g))
return -1;
/* check anodechain, make if not there */
if (!file->anodechain)
{
DB(Trace(2,"ReadFromObject","getting anodechain"));
if (!(file->anodechain = GetAnodeChain(file->le.anodenr, g)))
{
*error = ERROR_NO_FREE_STORE;
return -1;
}
}
#if ROLLOVER
if (IsRollover(file->le.info))
return ReadFromRollover(file,buffer,size,error,g);
else
#endif
return ReadFromFile(file,buffer,size,error,g);
}
ULONG WriteToObject(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
/* check write access */
if (!CheckWriteAccess(file, error, g))
return -1;
/* check anodechain, make if not there */
if (!file->anodechain)
{
if (!(file->anodechain = GetAnodeChain(file->le.anodenr, g)))
{
*error = ERROR_NO_FREE_STORE;
return -1;
}
}
/* changing file -> set notify flag */
file->checknotify = 1;
g->dirty = 1;
#if ROLLOVER
if (IsRollover(file->le.info))
return WriteToRollover(file,buffer,size,error,g);
else
#endif
return WriteToFile(file,buffer,size,error,g);
}
SFSIZE SeekInObject(fileentry_t *file, SFSIZE offset, LONG mode, SIPTR *error,
globaldata *g)
{
/* check access */
if (!CheckOperateFile(file,error,g))
return -1;
/* check anodechain, make if not there */
if (!file->anodechain)
{
if (!(file->anodechain = GetAnodeChain(file->le.anodenr, g)))
{
*error = ERROR_NO_FREE_STORE;
return -1;
}
}
#if ROLLOVER
if (IsRollover(file->le.info))
return SeekInRollover(file,offset,mode,error,g);
else
#endif
return SeekInFile(file,offset,mode,error,g);
}
SFSIZE ChangeObjectSize(fileentry_t *file, SFSIZE releof, LONG mode,
SIPTR *error, globaldata *g)
{
/* check access */
if (!CheckChangeAccess(file, error, g))
return -1;
/* Changing file -> set notify flag */
file->checknotify = 1;
*error = 0;
/* check anodechain, make if not there */
if (!file->anodechain)
{
if (!(file->anodechain = GetAnodeChain(file->le.anodenr, g)))
{
*error = ERROR_NO_FREE_STORE;
return -1;
}
}
#if ROLLOVER
if (IsRollover(file->le.info))
return ChangeRolloverSize(file,releof,mode,error,g);
else
#endif
return ChangeFileSize(file,releof,mode,error,g);
}
/**********************************************************************
*
**********************************************************************/
#if ROLLOVER
/* Read from rollover: at end of file,
* goto start
*/
static ULONG ReadFromRollover(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
#define direntry_m file->le.info.file.direntry
#define filesize_m GetDEFileSize(file->le.info.file.direntry, g)
struct extrafields extrafields;
ULONG read = 0;
LONG q; // quantity
LONG end, virtualoffset, virtualend, t;
DB(Trace(1,"ReadFromRollover","size = %lx offset = %lx\n",size,file->offset));
if (!size) return 0;
GetExtraFields(direntry_m,&extrafields);
/* limit access to end of file */
virtualoffset = file->offset - extrafields.rollpointer;
if (virtualoffset < 0) virtualoffset += filesize_m;
virtualend = virtualoffset + size;
virtualend = min(virtualend, extrafields.virtualsize);
end = virtualend - virtualoffset + file->offset;
if (end > filesize_m)
{
q = filesize_m - file->offset;
if ((read = ReadFromFile(file, buffer, q, error, g)) != q)
return read;
end -= filesize_m;
buffer += q;
SeekInFile(file, 0, OFFSET_BEGINNING, error, g);
}
q = end - file->offset;
t = ReadFromFile(file, buffer, q, error, g);
if (t == -1)
return (ULONG)t;
else
read += t;
return read;
#undef filesize_m
#undef direntry_m
}
/* Write to rollover file. First write upto end of rollover. Then
* flip to start.
* Max virtualsize = filesize-1
*/
static ULONG WriteToRollover(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
#define direntry_m file->le.info.file.direntry
#define filesize_m GetDEFileSize(file->le.info.file.direntry, g)
struct extrafields extrafields;
struct direntry *destentry;
union objectinfo directory;
struct fileinfo fi;
UBYTE entrybuffer[MAX_ENTRYSIZE];
LONG written = 0;
LONG q; // quantity
LONG end, virtualend, virtualoffset, t;
BOOL extend = FALSE;
DB(Trace(1,"WriteToRollover","size = %lx offset=%lx, file=%lx\n",size,file->offset,file));
GetExtraFields(direntry_m,&extrafields);
end = file->offset + size;
/* new virtual size */
virtualoffset = file->offset - extrafields.rollpointer;
if (virtualoffset < 0) virtualoffset += filesize_m;
virtualend = virtualoffset + size;
if (virtualend >= extrafields.virtualsize)
{
extrafields.virtualsize = min(filesize_m-1, virtualend);
extend = TRUE;
}
while (end > filesize_m)
{
q = filesize_m - file->offset;
t = WriteToFile(file, buffer, q, error, g);
if (t == -1) return (ULONG)t;
written += t;
if (t != q) return (ULONG)written;
end -= filesize_m;
buffer += q;
SeekInFile(file, 0, OFFSET_BEGINNING, error, g);
}
q = end - file->offset;
t = WriteToFile(file, buffer, q, error, g);
if (t == -1)
return (ULONG)t;
else
written += t;
/* change rollpointer etc */
if (extend && extrafields.virtualsize == filesize_m - 1)
extrafields.rollpointer = end + 1; /* byte PAST eof is offset 0 */
destentry = (struct direntry *)entrybuffer;
memcpy(destentry, direntry_m, direntry_m->next);
AddExtraFields(destentry, &extrafields);
/* commit changes */
if (!GetParent(&file->le.info, &directory, error, g))
return DOSFALSE;
else
ChangeDirEntry(file->le.info.file, destentry, &directory, &fi, g);
return (ULONG)written;
#undef direntry_m
#undef filesize_m
}
static SFSIZE SeekInRollover(fileentry_t *file, SFSIZE offset, LONG mode, SIPTR *error, globaldata *g)
{
#define filesize_m GetDEFileSize(file->le.info.file.direntry, g)
#define direntry_m file->le.info.file.direntry
struct extrafields extrafields;
LONG oldvirtualoffset, virtualoffset;
ULONG anodeoffset, blockoffset;
DB(Trace(1,"SeekInRollover","offset = %ld mode=%ld\n",offset,mode));
GetExtraFields(direntry_m,&extrafields);
/* do the seeking */
oldvirtualoffset = file->offset - extrafields.rollpointer;
if (oldvirtualoffset < 0) oldvirtualoffset += filesize_m;
switch (mode)
{
case OFFSET_BEGINNING:
virtualoffset = offset;
break;
case OFFSET_END:
virtualoffset = extrafields.virtualsize + offset;
break;
case OFFSET_CURRENT:
virtualoffset = oldvirtualoffset + offset;
break;
default:
*error = ERROR_SEEK_ERROR;
return -1;
}
if ((virtualoffset > extrafields.virtualsize) || virtualoffset < 0)
{
*error = ERROR_SEEK_ERROR;
return -1;
}
/* calculate real offset */
file->offset = virtualoffset + extrafields.rollpointer;
if (file->offset > filesize_m)
file->offset -= filesize_m;
/* calculate new values */
anodeoffset = file->offset >> BLOCKSHIFT;
blockoffset = file->offset & BLOCKSIZEMASK;
file->currnode = &file->anodechain->head;
CorrectAnodeAC(&file->currnode, &anodeoffset, g);
file->anodeoffset = anodeoffset;
file->blockoffset = blockoffset;
return oldvirtualoffset;
#undef filesize_m
#undef direntry_m
}
static SFSIZE ChangeRolloverSize(fileentry_t *file, SFSIZE releof, LONG mode,
SIPTR *error, globaldata *g)
{
#define filesize_m GetDEFileSize(file->le.info.file.direntry, g)
#define direntry_m file->le.info.file.direntry
struct extrafields extrafields;
SFSIZE virtualeof, virtualoffset;
union objectinfo directory;
struct fileinfo fi;
struct direntry *destentry;
UBYTE entrybuffer[MAX_ENTRYSIZE];
DB(Trace(1,"ChangeRolloverSize","offset = %ld mode=%ld\n",releof,mode));
GetExtraFields(direntry_m,&extrafields);
switch (mode)
{
case OFFSET_BEGINNING:
virtualeof = releof;
break;
case OFFSET_END:
virtualeof = extrafields.virtualsize + releof;
break;
case OFFSET_CURRENT:
virtualoffset = file->offset - extrafields.rollpointer;
if (virtualoffset < 0) virtualoffset += filesize_m;
virtualeof = virtualoffset + releof;
break;
default: /* bogus parameter -> ERROR_SEEK_ERROR */
virtualeof = -1;
break;
}
if (virtualeof < 0)
{
*error = ERROR_SEEK_ERROR;
return -1;
}
/* change virtual size */
if (virtualeof >= filesize_m)
extrafields.virtualsize = filesize_m - 1;
else
extrafields.virtualsize = virtualeof;
/* we don't update other filehandles or current offset here */
/* commit directoryentry changes */
destentry = (struct direntry *)entrybuffer;
memcpy(destentry, direntry_m, direntry_m->next);
AddExtraFields(destentry, &extrafields);
/* commit changes */
if (!GetParent(&file->le.info, &directory, error, g))
return DOSFALSE;
else
ChangeDirEntry(file->le.info.file, destentry, &directory, &fi, g);
return virtualeof;
#undef filesize_m
#undef direntry_m
}
#endif /* ROLLOVER */
/* <ReadFromFile>
**
** Specification:
**
** Reads 'size' bytes from file to buffer (if not readprotected)
** result: #bytes read; -1 = error; 0 = eof
*/
static ULONG ReadFromFile(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
ULONG anodeoffset, blockoffset, blockstoread;
ULONG fullblks, bytesleft;
ULONG t;
FSIZE tfs;
UBYTE *data = NULL, *dataptr;
BOOL directread = FALSE;
struct anodechainnode *chnode;
#if DELDIR
struct deldirentry *dde;
#endif
DB(Trace(1,"ReadFromFile","size = %lx offset = %lx\n",size,file->offset));
if (!CheckReadAccess(file, error, g))
return -1;
/* correct size and check if zero */
#if DELDIR
if (IsDelFile(file->le.info)) {
if (!(dde = GetDeldirEntryQuick(file->le.info.delfile.slotnr, g)))
return -1;
tfs = GetDDFileSize(dde, g) - file->offset;
}
else
#endif
tfs = GetDEFileSize(file->le.info.file.direntry, g) - file->offset;
if (!(size = min(tfs, size)))
return 0;
/* initialize */
anodeoffset = file->anodeoffset;
blockoffset = file->blockoffset;
chnode = file->currnode;
t = blockoffset + size;
fullblks = t>>BLOCKSHIFT; /* # full blocks */
bytesleft = t&BLOCKSIZEMASK; /* # bytes in last incomplete block */
/* check mask, both at start and end */
t = (((IPTR)(buffer-blockoffset+BLOCKSIZE))&~g->dosenvec->de_Mask) ||
(((IPTR)(buffer+size-bytesleft))&~g->dosenvec->de_Mask);
t = !t;
/* read indirect if
* - mask failure
* - too small
* - larger than one block (use 'direct' cached read for just one)
*/
if (!t || (fullblks<2*DIRECTSIZE && (blockoffset+size>BLOCKSIZE) &&
(blockoffset || (bytesleft&&fullblks<DIRECTSIZE))))
{
/* full indirect read */
blockstoread = fullblks + (bytesleft>0);
if (!(data = AllocBufmem (blockstoread<<BLOCKSHIFT, g)))
{
*error = ERROR_NO_FREE_STORE;
return -1;
}
dataptr = data;
}
else
{
/* direct read */
directread = TRUE;
blockstoread = fullblks;
dataptr = buffer;
/* read first blockpart */
if (blockoffset)
{
data = CachedReadD(chnode->an.blocknr + anodeoffset, error, g);
if (data)
{
NextBlockAC(&chnode, &anodeoffset, g);
/* calc numbytes */
t = BLOCKSIZE-blockoffset;
t = min(t, size);
memcpy(dataptr, data+blockoffset, t);
dataptr+=t;
if (blockstoread)
blockstoread--;
else
bytesleft = 0; /* single block access */
}
}
}
/* read middle part */
while (blockstoread && !*error)
{
if ((blockstoread + anodeoffset) >= chnode->an.clustersize)
t = chnode->an.clustersize - anodeoffset; /* read length */
else
t = blockstoread;
*error = DiskRead(dataptr, t, chnode->an.blocknr + anodeoffset, g);
if (!*error)
{
blockstoread -= t;
dataptr += t<<BLOCKSHIFT;
anodeoffset += t;
CorrectAnodeAC(&chnode, &anodeoffset, g);
}
}
/* read last block part/ copy read data to buffer */
if (!*error)
{
if (!directread)
memcpy(buffer, data+blockoffset, size);
else if (bytesleft)
{
data = CachedReadD(chnode->an.blocknr+anodeoffset, error, g);
if (data)
memcpy(dataptr, data, bytesleft);
}
}
if (!directread)
FreeBufmem(data, g);
if (!*error)
{
file->anodeoffset += fullblks;
file->blockoffset = (file->blockoffset + size)&BLOCKSIZEMASK; // not bytesleft!!
CorrectAnodeAC(&file->currnode, &file->anodeoffset, g);
file->offset += size;
return size;
}
else
{
DB(Trace(1,"Read","failed\n"));
return -1;
}
}
/* <WriteToFile>
**
** Specification:
**
** - Copy data in file at current position;
** - Automatic fileextension;
** - Error = bytecount <> opdracht
** - On error no position update
**
** - Clear Archivebit -> done by Touch()
**V- directory protection (amigados does not do this)
**
** result: num bytes written; DOPUS wants -1 = error;
**
** Implementation parts
**
** - Test on writeprotection; yes -> error;
** - Initialisation
** - Extend filesize
** - Write firstblockpart
** - Write all whole blocks
** - Write last block
** - | Update directory (if no errors)
** | Deextent filesize (if error)
*/
static ULONG WriteToFile(fileentry_t *file, UBYTE *buffer, ULONG size,
SIPTR *error, globaldata *g)
{
ULONG maskok, t;
ULONG totalblocks, oldblocksinfile;
FSIZE oldfilesize, newfileoffset;
ULONG newblocksinfile, bytestowrite, blockstofill;
ULONG anodeoffset, blockoffset;
UBYTE *data = NULL, *dataptr;
BOOL directwrite = FALSE;
struct anodechainnode *chnode;
int slotnr;
DB(Trace(1,"WriteToFile","size = %lx offset=%lx, file=%lx\n",size,file->offset,file));
/* initialization values */
chnode = file->currnode;
anodeoffset = file->anodeoffset;
blockoffset = file->blockoffset;
totalblocks = (blockoffset + size + BLOCKSIZEMASK)>>BLOCKSHIFT; /* total # changed blocks */
if (!(bytestowrite = size)) /* # bytes to be done */
return 0;
/* filesize extend */
oldfilesize = GetDEFileSize(file->le.info.file.direntry, g);
newfileoffset = file->offset + size;
/* Check if too large (QUAD) or overflowed (ULONG)? */
if (newfileoffset > MAX_FILE_SIZE || newfileoffset < file->offset || (LARGE_FILE_SIZE && newfileoffset > MAXFILESIZE32 && !g->largefile)) {
*error = ERROR_DISK_FULL;
return -1;
}
oldblocksinfile = (oldfilesize + BLOCKSIZEMASK)>>BLOCKSHIFT;
newblocksinfile = (newfileoffset + BLOCKSIZEMASK)>>BLOCKSHIFT;
if (newblocksinfile > oldblocksinfile)
{
t = newblocksinfile - oldblocksinfile;
if (!AllocateBlocksAC(file->anodechain, t, &file->le.info.file, g))
{
SetDEFileSize(file->le.info.file.direntry, oldfilesize, g);
*error = ERROR_DISK_FULL;
return -1;
}
}
/* BUG 980422: this CorrectAnodeAC mode because of AllocateBlockAC!! AND
* because anodeoffset can be outside last block! (filepointer is
* byte 0 new block
*/
CorrectAnodeAC(&chnode,&anodeoffset,g);
/* check mask */
maskok = (((IPTR)(buffer-blockoffset+BLOCKSIZE))&~g->dosenvec->de_Mask) ||
(((IPTR)(buffer-blockoffset+(totalblocks<<BLOCKSHIFT)))&~g->dosenvec->de_Mask);
maskok = !maskok;
/* write indirect if
* - mask failure
* - too small
*/
if (!maskok || (totalblocks<2*DIRECTSIZE && (blockoffset+size>BLOCKSIZE*2) &&
(blockoffset || totalblocks<DIRECTSIZE)))
{
/* indirect */
/* allocate temporary data buffer */
if (!(dataptr = data = AllocBufmem(totalblocks<<BLOCKSHIFT, g)))
{
*error = ERROR_NO_FREE_STORE;
goto wtf_error;
}
/* first blockpart */
if (blockoffset)
{
*error = DiskRead(dataptr, 1, chnode->an.blocknr + anodeoffset, g);
bytestowrite += blockoffset;
if (bytestowrite<BLOCKSIZE)
bytestowrite = BLOCKSIZE; /* the first could also be the last block */
}
/* copy all 'to be written' to databuffer */
memcpy(dataptr+blockoffset, buffer, size);
}
else
{
/* direct */
dataptr = buffer;
directwrite = TRUE;
/* first blockpart */
if (blockoffset || (totalblocks==1 && newfileoffset > oldfilesize))
{
ULONG fbp; /* first block part */
UBYTE *firstblock;
if (blockoffset)
{
slotnr = CachedRead(chnode->an.blocknr + anodeoffset, error, FALSE, g);
if (*error)
goto wtf_error;
}
else
{
/* for one block no offset growing file */
slotnr = CachedRead(chnode->an.blocknr + anodeoffset, error, TRUE, g);
}
/* copy data to cache and mark block as dirty */
firstblock = &g->dc.data[slotnr<<BLOCKSHIFT];
fbp = BLOCKSIZE-blockoffset;
fbp = min(bytestowrite, fbp); /* the first could also be the last block */
memcpy(firstblock+blockoffset, buffer, fbp);
MarkDataDirty(slotnr);
NextBlockAC(&chnode, &anodeoffset, g);
bytestowrite -= fbp;
dataptr += fbp;
totalblocks--;
}
}
/* write following blocks. If done, then blockoffset always 0 */
if (newfileoffset > oldfilesize)
{
blockstofill = totalblocks;
}
else
{
blockstofill = bytestowrite>>BLOCKSHIFT;
}
while (blockstofill && !*error)
{
UBYTE *lastpart = NULL;
UBYTE *writeptr;
if (blockstofill + anodeoffset >= chnode->an.clustersize)
t = chnode->an.clustersize - anodeoffset; /* t is # blocks to write now */
else
t = blockstofill;
writeptr = dataptr;
// last write, writing to end of file and last block won't be completely filled?
// all this just to prevent out of bounds memory read access.
if (t == blockstofill && (bytestowrite & BLOCKSIZEMASK) && newfileoffset > oldfilesize)
{
// limit indirect to max 2 * DIRECTSIZE
if (t > 2 * DIRECTSIZE) {
// > 2 * DIRECTSIZE: write only last partial block indirectly
t--;
} else {
// indirect write last block(s), including final partial block.
if (!(lastpart = AllocBufmem(t<<BLOCKSHIFT, g)))
{
if (t == 1)
{
// no memory, do slower cached final partial block write
goto indirectlastwrite;
}
t /= 2;
} else {
memcpy(lastpart, dataptr, bytestowrite);
writeptr = lastpart;
}
}
}
*error = DiskWrite(writeptr, t, chnode->an.blocknr + anodeoffset, g);
if (!*error)
{
blockstofill -= t;
dataptr += t<<BLOCKSHIFT;
bytestowrite -= t<<BLOCKSHIFT;
anodeoffset += t;
CorrectAnodeAC(&chnode, &anodeoffset, g);
}
if (lastpart) {
bytestowrite = 0;
FreeBufmem(lastpart, g);
}
}
indirectlastwrite:
/* write last block (RAW because cache direct), preserve block's old contents */
if (bytestowrite && !*error)
{
UBYTE *lastblock;
slotnr = CachedRead(chnode->an.blocknr + anodeoffset, error, FALSE, g);
if (!*error)
{
lastblock = &g->dc.data[slotnr<<BLOCKSHIFT];
memcpy(lastblock, dataptr, bytestowrite);
MarkDataDirty(slotnr);
}
}
/* free mem for indirect write */
if (!directwrite)
FreeBufmem(data, g);
if (!*error)
{
file->anodeoffset += (blockoffset + size)>>BLOCKSHIFT;
file->blockoffset = (blockoffset + size)&BLOCKSIZEMASK;
CorrectAnodeAC(&file->currnode, &file->anodeoffset, g);
file->offset += size;
SetDEFileSize(file->le.info.file.direntry, max(oldfilesize, file->offset), g);
MakeBlockDirty((struct cachedblock *)file->le.info.file.dirblock, g);
return size;
}
wtf_error:
if (newblocksinfile>oldblocksinfile)
{
/* restore old state of file */
#if VERSION23
SetDEFileSize(file->le.info.file.direntry, oldfilesize, g);
MakeBlockDirty((struct cachedblock *)file->le.info.file.dirblock, g);
FreeBlocksAC(file->anodechain, newblocksinfile-oldblocksinfile, freeanodes, g);
#else
FreeBlocksAC(file->anodechain, newblocksinfile-oldblocksinfile, freeanodes, g);
SetDEFileSize(file->le.info.file.direntry, oldfilesize, g);
MakeBlockDirty((struct cachedblock *)file->le.info.file.dirblock, g);
#endif
}
DB(Trace(1,"WriteToFile","failed\n"));
return -1;
}
/* SeekInFile